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Preparation method of nanopowder-based composite thermal insulation material

A technology of nano-powder and heat-insulating material, applied in the field of heat-insulating material, can solve the problems of high energy consumption in the supercritical drying process, complicated preparation process, difficult production, etc., so as to achieve no potential safety hazard, simple preparation process, and improved mechanics. performance effect

Inactive Publication Date: 2014-04-02
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is mainly to solve the problems of complex preparation process of traditional airgel heat insulation materials, high energy consumption and high risk in the supercritical drying process, and difficulty in realizing large-scale industrial production.

Method used

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  • Preparation method of nanopowder-based composite thermal insulation material
  • Preparation method of nanopowder-based composite thermal insulation material
  • Preparation method of nanopowder-based composite thermal insulation material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] SiO by gas phase method 2 70wt%, SiC25wt%, 5% alkali-free ultra-fine glass fiber with a length of 5mm, add it to the high-speed modified dispersion device, run it at 1200 speed for 30 minutes, take out the mixed material and put it into the mold, and then use a hydraulic press to The molding pressure was pressed into a block material with a size of 80mm×20mm×20mm, and finally the block material was pressed at a pressing speed of 1N / s until the sample ruptured. The results showed that the block composite insulation The strength increased from 0.05MPa without adding reinforcing fibers to 0.29MPa.

Embodiment 2

[0022] SiO by gas phase method 2 70wt%, SiC25wt%, 5% non-alkali ultrafine glass fiber with a length of 5mm, add it to the high-speed modified dispersion device, run it at 1200 rpm for 30 minutes, take out the mixed material and put it into the mold, and then use a hydraulic press to The molding pressure was pressed into a block material with a size of 100mm×100mm×14.3mm. Finally, the thermal conductivity of the sample was measured by the hot wire method. The results showed that after adding the opacifying agent, the thermal insulation performance of the sample was greatly improved. From 0.119W / (m·K) without adding opacifying agent to 0.044W / (m·K).

Embodiment 3

[0024] SiO by gas phase method 2 70wt%, gas phase method Al 2 o 3 5wt%, SiC20wt%, 5% alkali-free ultra-fine glass fiber with a length of 5mm, add it to the high-speed modified dispersion device, run it at 1200 rpm for 30 minutes, take out the mixed material and put it into the mold, and then use a hydraulic press to The molding pressure is pressed and molded, then calcined at 1000°C, and kept for 1h, and finally the sample is taken out to measure its volume shrinkage. The results show that adding the gas-phase method Al 2 o 3 Finally, the shape shrinkage of the sample at high temperature is significantly improved, and the volume stability is significantly improved. At 1000°C, the volume shrinkage rate decreased from 18.49% to 3.47%.

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Abstract

The invention provides a preparation method of a nanopowder-based composite thermal insulation material. The preparation method comprises the following steps: by using nanopowder as a base material and alkali-free ultrafine glass fibers, aluminium silicate fibers, zirconia fibers, multicrystal mullite fibers and the like as reinforcing materials, adding infrared opacifiers (potassium hexatitanate whiskers, SiC, ZrSiO4 and rutile or anatase TiO2), adding a high-temperature contraction inhibitor and a hydrophobe as required and carrying out dispersion, blending, compression forming and the like, thus preparing the nanopowder-based composite thermal insulation material. The preparation method belongs to the dry forming preparation process and is simple in preparation process and safe and reliable in operation process. The press-formed thermal insulation material has good mechanical property, thermal insulation property, high-temperature thermal stability and hydrophobicity and can meet the requirements of the fields such as aerospace, the high-temperature industry and the like for efficient thermal insulation materials.

Description

1. Technical field [0001] The invention relates to a preparation method of a nano-powder-based composite thermal insulation material, which belongs to the technical field of thermal insulation materials. 2. Background technology [0002] Nanoporous super thermal insulation material is a thermal insulation material whose guiding thermal coefficient is lower than the thermal conductivity of "non-convective air". Aerospace and other fields. The most representative one is airgel thermal insulation material, but its preparation process is complicated, the supercritical drying process consumes high energy, is expensive, dangerous, and the output is small, and the airgel itself has low strength and poor high temperature resistance. , heat insulation effect and other shortcomings limit its large-scale use. [0003] In order to solve the problems of airgel itself, such as poor mechanical properties and poor thermal insulation performance, researchers mainly solve the problem from t...

Claims

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Application Information

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IPC IPC(8): C04B30/00C04B30/02C04B14/42
Inventor 封金鹏黄强冯霞马少健莫伟杨金林苏秀娟林美群张敏
Owner GUANGXI UNIV
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